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Earth defenceless against big asteroid, experts warn

Scientists would need at least six years' notice to prevent a small asteroid
from smashing into the Earth using existing technology.

But anything more substantial than 200m across or on a trajectory that evades
detection until just a few years before impact would leave humankind virtually
helpless to defend itself.

Experts at the first planetary defence conference, held this week in the US,
issued the warning after starting work on preliminary plans to fend off cosmic
catastrophe.

They have been challenged to devise detailed schemes to deal with four
scenarios devised to represent threats that the Earth might face.

A study by specialists at the Aerospace Corporation and organisers of the Los
Angeles conference suggests that only one of the scenarios could be defended
against at present.

This involves a 200m asteroid called Athos crashing into the ocean off the
coast of California in 2016, 11 years after being detected.

The $12 billion (£6.3 billion) plan involves two salvoes of at least six
nuclear warhead-carrying spacecraft deflecting the asteroid from its
course.

The Earth has suffered many collisions in the past. Scientists have debated the
risks of future catastrophes and have started plotting the courses of nearby
asteroids.

The planetary defence conference attracted engineers, astronomers,
policy-makers and even psychologists from around the world.

A delegation from the European Space Agency, led by David Southwood, director
of science, pulled out of the conference at the last minute to attend the
rescheduled launch of the Rosetta comet probe.

William Ailor, the conference chairman, said it was vital to start practical
mission planning now. "We are getting to the point where we could carry out a
real mission to deflect an asteroid," he said.

Dr Ailor said the key problem of the uncertainty surrounding asteroid
trajectories could be improved through better observation programmes.

The Aerospace Corporation plan to deal with Athos relies on action being taken
when only a slim chance of a collision is predicted.

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